The person in distress entered the mountain from the Oku-Shinkan Dam power plant gate around midnight on June 22, arrived at the Shinkan Porosiri Hut around 5:00 p.m. on the same day, and stayed at the lodge on the same day. At around 5:00 a.m. on the following day, June 23, they departed from the Shinkan Porosiri Hut and were climbing Horoshiri-dake when, at around 6:00 a.m. on the same day, they became dehydrated due to lack of water supply and developed numbness in their right toes, so they stopped climbing and at around 2:00 p.m. on the same day, their guide told them to leave the dam at the same time. At around 2:00 p.m. on the same day, the accompanying guide called the fire department using a telephone at the dam office and requested rescue. Local firefighters rescued the person in distress.